The key to a Macgyver fix is using what you can find not carrying it or at least it not being obvious, this makes for more out of the box thinking.
My best fix that lasted the longest was a fix on an english guys Harley Davidson Sportster. He was having oiling issues and I stopped to help him at the side of the road in Argentina.
I had Duct Tape with me, found a yogurt carton plastic lid on the side of the road and did a work around for him. I told him "in the next big town get it fixed but this will get you there."
A few months later I got a message from him as he arrived at his local HD dealership, having ridden from Argentina to Alaska, then to New York, then to his dealership in England.
He said his mechanic smiled and told him "that's exactly what i'd have done to get here for the last few miles." when he then told him about his trip of 20,000 miles and it had lasted the whole way, he said the mechanic almost fainted.
Sorry but I don't have a photo of the Macgyvering so you'll have to use your imagination for an image